Nvidia CEO Jensen Huang has been asked by three House Republican committee chairs to brief Congress behind closed doors about his reported ties to a woman accused of spying for China.Why it matters: The request escalates the scrutiny of the Nvidia CEO over his alleged relationship with Alice Huang, a businesswoman accused of spying for China.Catch up quick: Jensen Huang and Alice Huang purportedly had a "close" relationship, per reporting from the New York Times.